How to test a firewall with NAT?

Hello Everybody,

I am trying to move one of my servers/routers from linux/iptables to freebsd/pf, and need a methodology of testing the pf firewall ruleset before it will go in production. I cannot experiment on live network, because it's a busy server.

I only have one other machine available.
What can I do and what tool can you recommend?

Thank you.
--
With best regards,
Gregory Edigarov
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